In article ,
says...


"Corky Scott" wrote in message
.. .
On Sun, 17 Oct 2004 17:04:26 -0800, "Ron Webb"
wrote:

Hello

Does anyone have any experience getting the bolt pattern off the
transmission side of an auto engine?

I'm building a PSRU, and I need to make the plate that bolts to the
engine.
The rest of the pattern is generic, but that is engine specific.

I have tried several ways of measuring the holes in the block, but
I'm
sure
I can't get accuracy better than 1/10 inch or so. Surly engineering
drawings
for these patterns are available somewhere.

Here's an idea that I've had for some time. Machine some bolts that
fit the threads of the block into points. Thread them into the bloc
k
such that the pointed end is facing out. Place an aluminum sheet (a
t
least 1/4 thick) over the engine and tap each bolt location with a
hammer. This center punches the bolt's location.

Take the template over to your drill press and drill out the center
punched holes. That should be very accurate.

Corky Scott

Thanks guys.

Both good suggestions.

But the one dimension that must be DEAD accurate is the position of th
e
center of the crank relative to the dowel pins.. Neither suggestion is
going
to solve this one without taking the engine apart. I am working on a n
ew
aluminum Ford 4.6L V8 short block, so the entire lower end is already
in
place.

How about working from the transmission/bellhouseing assembly instead?
Put transfer punches in the holes as suggested. Machine a short
extension for the transmission shaft to transfer its location to your
pattern.